16 people, split into pairs, fight in medium sized rooms. The winner of each duel advances through a door to the next room/challenger. There would need to be some checks to deal with AFKers. Ultimately, it would be a series of 1v1’s that leads up to a final duel where everyone would be watching.

OR….

16 people with only two spawning at the start. If you win a duel, you would get put back in one of two queues. If you die, you go into permanent spectating until the round is over (like LTS). I suggest we do it this way, if there are only 2 fighting at a time. That way the same guy doesn’t get to fight over and over through a wave of players.